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Subsequent events (Details) - Subsequent event
Nov. 08, 2018
USD ($)
Nov. 05, 2018
Nov. 01, 2018
USD ($)
Subsequent Event [Line Items]      
Proceeds from sale, less costs to sell     $ 287
First Amendment To Credit Agreement And Security Agreement | Line of Credit      
Subsequent Event [Line Items]      
Line of credit facility, availability of revolving commitment, fixed charge coverage ratio threshold   12.50%  
Cleveland Loan | Loans Payable      
Subsequent Event [Line Items]      
Issued amount of debt $ 305    
Debt agreement term 60 months    
Interest rate, fixed percentage 3.56%    
As Of August 31, 2018 Or September 30, 2018 | First Amendment To Credit Agreement And Security Agreement | Line of Credit      
Subsequent Event [Line Items]      
Line of credit facility, covenant terms, fixed charge coverage ratio   1.1  
On Or After October 31, 2018 | First Amendment To Credit Agreement And Security Agreement | Line of Credit      
Subsequent Event [Line Items]      
Line of credit facility, covenant terms, fixed charge coverage ratio   1.1